[FFmpeg-cvslog] avformat/svag: fix division by zero

ffmpeg | branch: release/3.0 | James Almer | Mon Mar 28 21:34:08 2016 -0300| [7b1e020fc5edbc09774d6fe7857d47d29f157a13] | committer: James Almer avformat/svag: fix division by zero Fixes ticket #5386 Signed-off-by: James Almer (cherry picked from commit d5a3578350a3901a26df39df196bb085760ec4

[FFmpeg-cvslog] avformat/svag: fix division by zero

ffmpeg | branch: master | James Almer | Mon Mar 28 21:34:08 2016 -0300| [d5a3578350a3901a26df39df196bb085760ec46f] | committer: James Almer avformat/svag: fix division by zero Fixes ticket #5386 Signed-off-by: James Almer > http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=d5a3578350